Portion of an operation controller for electronic computers



FIG. 1 is a top, front and right side perspective view of a portion of an operation controller for electronic computers showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a rear elevational view thereof.

The broken line showing of the remainder of the operation controller for electronic computers is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for portion of an operation controller for electronic computers, as shown and described. 